If the Fed conducts an open-market sale, bank reserves decrease, and the money supply is likely to decrease.
The Federal Reserve (the Fed) uses "open market operations" (OMO) to refer to the process of buying and selling U.S. Treasury securities as well as other securities on the open market in order to manage the amount of cash kept in reserve by U.S. banks. The Fed purchases and sells Treasury securities in order to increase the quantity of money in circulation and to decrease long-term interest rates.
The U.S. Federal Reserve uses open market operations to control the amount of money in circulation by buying and selling bonds and other securities. The Fed can utilize these transactions to increase or reduce the amount of money in the banking system and to raise or lower short-term interest rates, depending on the objectives of its monetary policy.
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